/Engine/Source/Runtime/Engine/Classes/GameFramework/Character.h
Called on client after position update is received to respond to the new location and rotation. Actual change in location is expected to occur in CharacterMovement->SmoothCorrection(), after which this occurs. Default behavior is to check for penetration in a blocking object if bClientCheckEncroachmentOnNetUpdate is enabled, and set bSimGravityDisabled=true if so.
virtual void OnUpdateSimulatedPosition ( const FVector & OldLocation, const FQuat & OldRotation )